<?php
echo '<pre>';
// define arrays
$dark = array(
            'up'=>'kanpur',
             1 => 'india',
            'mp'=> 'indore',
            'bh'=>'patna');
$light = array(
            'bh'=>'chapra',
             1 =>'china',
             'up'=>'lucknow',
             'mp'=>'bhopal',
             'kn'=>'banglore');
$colors = array_merge($dark, $light);
print_r($colors);
